Combustion-type power tool having ignition proof arrangement

(19)

(11)

EP 1 693 158 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	28.04.2010 Bulletin 2010/17

(43)	Date of publication A2:
	23.08.2006 Bulletin 2006/34

(21)	Application number: 06250878.3

(22)	Date of filing: 18.02.2006

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International Patent Classification (IPC):

B25C 1/08^(2006.01)

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
	Designated Extension States:
	AL BA HR MK YU

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Priority:

18.02.2005 JP 2005043276

(71)	Applicant: HITACHI KOKI CO., LTD.
	Tokyo 108-6020 (JP)

(72)

Inventors:

Nishikawa, Tomomasa c/o Hitachi Koki Co., Ltd.
Hitachinaka-shi Ibaraki 312-8502 (JP)
Ohmori, Yasuki c/o Hitachi Koki Co., Ltd.
Hitachinaka-shi Ibaraki 312-8502 (JP)
Ohtsu, Shinki c/o Hitachi Koki Co., Ltd.
Hitachinaka-shi Ibaraki 312-8502 (JP)
Yamamoto, Kunio c/o Hitachi Koki Co., Ltd.
Hitachinaka-shi Ibaraki 312-8502 (JP)
Akiba, Yoshitaka c/o Hitachi Koki Co., Ltd.
Hitachinaka-shi Ibaraki 312-8502 (JP)
Fujisawa, Haruhisa c/o Hitachi Koki Co., Ltd.
Hitachinaka-shi Ibaraki 312-8502 (JP)

(74)	Representative: Wightman, David Alexander
	Barker Brettell LLP 138 Hagley Road Edgbaston Birmingham B16 9PW Edgbaston Birmingham B16 9PW (GB)

(54)	Combustion-type power tool having ignition proof arrangement

(57) In the combustion-type power tool, a first shelter wall (35A) and a second shelter wall (35B) are disposed to partially surround an area between an ignition plug (14) and an ignition ground (34). Two gaps (36) are provided between the first and second shelter walls. The first shelter wall extends radially outwardly from an outer peripheral surface (32A) of a motor boss (32), and also protrudes from an end face (31) in an axial direction of a fan shaft (13A). The first shelter wall has a lower end surface inclined such that an axial length between the end face and the lower end surface is gradually reduced toward radially outer end of the first shelter wall.

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